It depends on the job — but more plumbing work requires a permit than most homeowners realize. Here’s a practical guide to what typically does and doesn’t require one, and why it matters.
“The rule of thumb I give homeowners is simple: if a pipe is moving, a new connection is being made, or a major appliance is being installed, assume a permit is required until someone tells you otherwise — in writing, with an explanation. That assumption protects you.”
— Claire Mbuyi, licensed journeyperson plumber and owner of a residential plumbing company in the Greater Toronto Area, with 14 years in the trade
Table of Contents
Jobs That Typically Require a Plumbing Permit
- Installing plumbing in a new location (basement bathroom, kitchen island sink, laundry rough-in)
- Extending or modifying the drain, waste, and vent (DWV) system
- Connecting new supply lines to the main water supply
- Replacing or installing a water heater
- Installing a backflow prevention device
- Any plumbing connected to a sanitary or storm sewer
- Re-piping a portion or all of the home
The specific requirements vary by municipality. When in doubt, contact your local building department directly — they can tell you in minutes whether your specific job requires a permit.
Jobs That Typically Do Not Require a Permit
- Replacing a faucet in the same location with the same type
- Replacing a toilet in the same location
- Replacing a showerhead or tub spout
- Repairing a leaking pipe in kind (same location, same size, same material)
- Clearing a blocked drain
These are generally considered maintenance or like-for-like replacements that don’t affect the structure of the plumbing system.
Who Pulls the Permit?
Always the licensed plumber — never the homeowner. If a plumber suggests that you pull the permit yourself as the property owner, that’s a red flag. It typically means the plumber is not licensed for the work they’re doing, and it transfers the legal and insurance liability to you.
For more detail on this: Questions to Ask a Plumber About Permits and Inspections
What Happens If You Skip a Required Permit?
Unpermitted plumbing work creates real risk:
Insurance claims may be denied. If a leak or failure involves unpermitted plumbing, your insurer may investigate and have grounds to reduce or deny the claim.
Problems at sale. Home inspections often flag unpermitted work. Buyers may require legalization, which typically involves opening walls for inspection — at your expense.
Fines and compliance orders. Municipalities can issue fines for unpermitted work and require the work to be inspected retroactively.
Safety. The permit and inspection process exists to ensure the work meets code. Plumbing that hasn’t been inspected may not.
Related Questions
- Questions to Ask a Plumber Before You Hire One
- Questions to Ask a Plumber About Permits and Inspections
- Red Flags When Hiring a Plumber
- Questions to Ask a Plumber About Licensing and Insurance
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